Reclaimed Heat Treated European Hardwood Pallet Boards, Seen here are 20 boards for $20 + Shipping/tax. You can get all your pallet supply needs here as we sell many different pallet board sizes, colors, etc.
DIY: Planter Boxes - To reduce the cost of this project, you may entertain the idea of using reclaimed wood from wood pallets. When using wood pallets for projects, look for a ” HT ” stamped upon the pallet…. it means it is heat treated NOT chemically treated.
Stolen from Reddit, this is beautiful, made out of pallets, though it came up in the comments that you really shouldn't use pallets inside (if they're chemically treated, or even heat treated.) But this could be done with lumber from any other source pretty easily. Credit to Redditor duncey.